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| 1 /* |
| 2 * Copyright (C) 2011 Apple Inc. All Rights Reserved. |
| 3 * Copyright (C) 2011 Google Inc. All Rights Reserved. |
| 4 * |
| 5 * Redistribution and use in source and binary forms, with or without |
| 6 * modification, are permitted provided that the following conditions |
| 7 * are met: |
| 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright |
| 11 * notice, this list of conditions and the following disclaimer in the |
| 12 * documentation and/or other materials provided with the distribution. |
| 13 * |
| 14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 */ |
| 26 |
| 27 |
| 28 #include "config.h" |
| 29 #include "RuntimeEnabledFeatures.h" |
| 30 #include "platform/mac/NSScrollerImpDetails.h" |
| 31 |
| 32 namespace { |
| 33 |
| 34 // Declare notification names from the 10.7 SDK. |
| 35 #if !defined(MAC_OS_X_VERSION_10_7) || MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_V
ERSION_10_7 |
| 36 NSString* NSPreferredScrollerStyleDidChangeNotification = @"NSPreferredScrollerS
tyleDidChangeNotification"; |
| 37 #endif |
| 38 |
| 39 // Storing the current NSScrollerStyle as a global is appreciably faster than |
| 40 // having it be a property of ScrollerStylerObserver. |
| 41 NSScrollerStyle g_scrollerStyle = NSScrollerStyleLegacy; |
| 42 |
| 43 } // anonymous namespace |
| 44 |
| 45 @interface ScrollerStyleObserver : NSObject |
| 46 - (id)init; |
| 47 - (void)preferredScrollerStyleDidChange:(NSNotification*)notification; |
| 48 @end |
| 49 |
| 50 @implementation ScrollerStyleObserver |
| 51 - (id)init |
| 52 { |
| 53 if ((self = [super init])) { |
| 54 if ([NSScroller respondsToSelector:@selector(preferredScrollerStyle)]) { |
| 55 g_scrollerStyle = [NSScroller preferredScrollerStyle]; |
| 56 NSNotificationCenter* center = [NSNotificationCenter defaultCenter]; |
| 57 [center addObserver:self |
| 58 selector:@selector(preferredScrollerStyleDidChange:) |
| 59 name:NSPreferredScrollerStyleDidChangeNotification |
| 60 object:nil]; |
| 61 } |
| 62 } |
| 63 return self; |
| 64 } |
| 65 |
| 66 - (void)preferredScrollerStyleDidChange:(NSNotification*)notification |
| 67 { |
| 68 g_scrollerStyle = [NSScroller preferredScrollerStyle]; |
| 69 } |
| 70 @end |
| 71 |
| 72 namespace WebCore { |
| 73 |
| 74 bool isScrollbarOverlayAPIAvailable() |
| 75 { |
| 76 static bool apiAvailable = |
| 77 [NSClassFromString(@"NSScrollerImp") respondsToSelector:@selector(scroll
erImpWithStyle:controlSize:horizontal:replacingScrollerImp:)] |
| 78 && [NSClassFromString(@"NSScrollerImpPair") instancesRespondToSelector:@
selector(scrollerStyle)]; |
| 79 return apiAvailable; |
| 80 } |
| 81 |
| 82 NSScrollerStyle recommendedScrollerStyle() |
| 83 { |
| 84 if (RuntimeEnabledFeatures::overlayScrollbarsEnabled()) |
| 85 return NSScrollerStyleOverlay; |
| 86 |
| 87 // The ScrollerStyleObserver will update g_scrollerStyle at init and when ne
eded. |
| 88 // This function is hot. |
| 89 // http://crbug.com/303205 |
| 90 static ScrollerStyleObserver* scrollerStyleObserver = [[ScrollerStyleObserve
r alloc] init]; |
| 91 (void)scrollerStyleObserver; |
| 92 return g_scrollerStyle; |
| 93 } |
| 94 |
| 95 } |
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